The current front-runner is “The Crazy Ape” by Albert Szent-Györgyi, who won the Nobel Prize for discovering ascorbic acid.

It's about how war is perpetrated by the old against the young. I've carried it next to my heart since I was fourteen.

Also, it's quite short and will definitely fit in the space.

A bit more about it: https://mathstodon.xyz/@mjd/116411220100252049